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//===--- Address.h - Address Representation ---------------------*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// A structure for holding the address of an object.
//
//===----------------------------------------------------------------------===//
#ifndef SWIFT_IRGEN_ADDRESS_H
#define SWIFT_IRGEN_ADDRESS_H
#include "IRGen.h"
#include "llvm/ADT/ilist.h"
#include "llvm/IR/Argument.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Value.h"
namespace swift {
namespace irgen {
/// The address of an object in memory.
class Address {
llvm::Value *Addr;
llvm::Type *ElementType;
Alignment Align;
public:
Address() : Addr(nullptr) {}
Address(llvm::Value *addr, llvm::Type *elementType, Alignment align)
: Addr(addr), ElementType(elementType), Align(align) {
if (addr == llvm::DenseMapInfo<llvm::Value *>::getEmptyKey() ||
llvm::DenseMapInfo<llvm::Value *>::getTombstoneKey())
return;
assert(addr != nullptr && "building an invalid address");
}
llvm::Value *operator->() const {
assert(isValid());
return getAddress();
}
bool isValid() const { return Addr != nullptr; }
llvm::Value *getAddress() const { return Addr; }
Alignment getAlignment() const {
return Align;
}
llvm::PointerType *getType() const {
return cast<llvm::PointerType>(Addr->getType());
}
llvm::Type *getElementType() const { return ElementType; }
bool operator==(Address RHS) const {
return Addr == RHS.Addr && ElementType == RHS.ElementType &&
Align == RHS.Align;
}
bool operator!=(Address RHS) const { return !(*this == RHS); }
};
/// An address in memory together with the (possibly null) heap
/// allocation which owns it.
class OwnedAddress {
Address Addr;
llvm::Value *Owner;
public:
OwnedAddress() : Owner(nullptr) {}
OwnedAddress(Address address, llvm::Value *owner)
: Addr(address), Owner(owner) {}
llvm::Value *getAddressPointer() const { return Addr.getAddress(); }
Alignment getAlignment() const { return Addr.getAlignment(); }
Address getAddress() const { return Addr; }
llvm::Value *getOwner() const { return Owner; }
Address getUnownedAddress() const {
assert(getOwner() == nullptr);
return getAddress();
}
operator Address() const { return getAddress(); }
bool isValid() const { return Addr.isValid(); }
};
/// An address in memory together with the local allocation which owns it.
class ContainedAddress {
/// The address of an object of type T.
Address Addr;
/// The container of the address.
Address Container;
public:
ContainedAddress() {}
ContainedAddress(Address container, Address address)
: Addr(address), Container(container) {}
llvm::Value *getAddressPointer() const { return Addr.getAddress(); }
Alignment getAlignment() const { return Addr.getAlignment(); }
Address getAddress() const { return Addr; }
Address getContainer() const { return Container; }
bool isValid() const { return Addr.isValid(); }
};
/// An address on the stack together with an optional stack pointer reset
/// location.
class StackAddress {
/// The address of an object of type T.
Address Addr;
/// In a normal function, the result of llvm.stacksave or null.
/// In a coroutine, the result of llvm.coro.alloca.alloc.
/// In an async function, the result of the taskAlloc call.
llvm::Value *ExtraInfo;
public:
StackAddress() : ExtraInfo(nullptr) {}
StackAddress(Address address, llvm::Value *extraInfo = nullptr)
: Addr(address), ExtraInfo(extraInfo) {}
/// Return a StackAddress with the address changed in some superficial way.
StackAddress withAddress(Address addr) const {
return StackAddress(addr, ExtraInfo);
}
llvm::Value *getAddressPointer() const { return Addr.getAddress(); }
Alignment getAlignment() const { return Addr.getAlignment(); }
Address getAddress() const { return Addr; }
llvm::Value *getExtraInfo() const { return ExtraInfo; }
bool isValid() const { return Addr.isValid(); }
bool operator==(StackAddress RHS) const {
return Addr == RHS.Addr && ExtraInfo == RHS.ExtraInfo;
}
bool operator!=(StackAddress RHS) const { return !(*this == RHS); }
};
} // end namespace irgen
} // end namespace swift
namespace llvm {
template <>
struct DenseMapInfo<swift::irgen::Address> {
static swift::irgen::Address getEmptyKey() {
return swift::irgen::Address(DenseMapInfo<llvm::Value *>::getEmptyKey(),
DenseMapInfo<llvm::Type *>::getEmptyKey(),
swift::irgen::Alignment(8));
}
static swift::irgen::Address getTombstoneKey() {
return swift::irgen::Address(DenseMapInfo<llvm::Value *>::getTombstoneKey(),
DenseMapInfo<llvm::Type *>::getTombstoneKey(),
swift::irgen::Alignment(8));
}
static unsigned getHashValue(swift::irgen::Address address) {
return detail::combineHashValue(
DenseMapInfo<llvm::Value *>::getHashValue(address.getAddress()),
detail::combineHashValue(
DenseMapInfo<llvm::Type *>::getHashValue(address.getElementType()),
DenseMapInfo<swift::irgen::Alignment::int_type>::getHashValue(
address.getAlignment().getValue())));
}
static bool isEqual(swift::irgen::Address LHS, swift::irgen::Address RHS) {
return LHS == RHS;
}
};
template <>
struct DenseMapInfo<swift::irgen::StackAddress> {
static swift::irgen::StackAddress getEmptyKey() {
return swift::irgen::StackAddress(
DenseMapInfo<swift::irgen::Address>::getEmptyKey(),
DenseMapInfo<llvm::Value *>::getEmptyKey());
}
static swift::irgen::StackAddress getTombstoneKey() {
return swift::irgen::StackAddress(
DenseMapInfo<swift::irgen::Address>::getTombstoneKey(),
DenseMapInfo<llvm::Value *>::getTombstoneKey());
}
static unsigned getHashValue(swift::irgen::StackAddress address) {
return detail::combineHashValue(
DenseMapInfo<swift::irgen::Address>::getHashValue(address.getAddress()),
DenseMapInfo<swift::irgen::Alignment::int_type>::getHashValue(
address.getAlignment().getValue()));
}
static bool isEqual(swift::irgen::StackAddress LHS,
swift::irgen::StackAddress RHS) {
return LHS == RHS;
}
};
} // end namespace llvm
#endif
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